/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.yyfax.ph.common.scan.idcard;

import android.content.Context;
import android.graphics.Point;
import android.graphics.Rect;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.Build;
import android.os.Handler;
import android.view.SurfaceHolder;

import com.yyfax.common.CLog;

import java.io.IOException;

/**
 * This object wraps the Camera service object and expects to be the only one talking to it. The
 * implementation encapsulates the steps needed to take preview-sized images, which are used for
 * both preview and decoding.
 *
 * @author dswitkin@google.com (Daniel Switkin)
 */
public final class CameraManager {

  private static final String TAG = CameraManager.class.getSimpleName();

  private static final int MIN_FRAME_WIDTH  = 800;
  private static final int MIN_FRAME_HEIGHT = 480;
  private static final int MAX_FRAME_WIDTH  = 1280;
  private static final int MAX_FRAME_HEIGHT = 800;

  private static CameraManager cameraManager;

  static final int SDK_INT; // Later we can use Build.VERSION.SDK_INT
  static {
    int sdkInt;
    try {
      sdkInt = Integer.parseInt(Build.VERSION.SDK);
    } catch (NumberFormatException nfe) {
      // Just to be safe
      sdkInt = 10000;
    }
    SDK_INT = sdkInt;
  }

  private final CameraConfigurationManager configManager;
  private Camera camera;
  private Rect framingRect;
  private Rect framingRectInPreview;
  private boolean initialized;
  private boolean previewing;
  private final boolean useOneShotPreviewCallback;
  /**
   * Preview frames are delivered here, which we pass on to the registered handler. Make sure to
   * clear the handler so it will only receive one message.
   */
  private final PreviewCallback previewCallback;
  /** Autofocus callbacks arrive here, and are dispatched to the Handler which requested them. */
  private final AutoFocusCallback autoFocusCallback;
  
  private final PictureCallback pictureCallback;

  /**
   * Initializes this static object with the Context of the calling Activity.
   *
   *  The Activity which wants to use the camera.
   */
  public static void init(Context context) {
    if (cameraManager == null) {
      cameraManager = new CameraManager(context);
    }
  }

  /**
   * Gets the CameraManager singleton instance.
   *
   * @return A reference to the CameraManager singleton.
   */
  public static CameraManager get() {
    return cameraManager;
  }

  private CameraManager(Context context) {

    configManager = new CameraConfigurationManager(context);

    // Camera.setOneShotPreviewCallback() has a race condition in Cupcake, so we use the older
    // Camera.setPreviewCallback() on 1.5 and earlier. For Donut and later, we need to use
    // the more efficient one shot callback, as the older one can swamp the system and cause it
    // to run out of memory. We can't use SDK_INT because it was introduced in the Donut SDK.
    //useOneShotPreviewCallback = Integer.parseInt(Build.VERSION.SDK) > Build.VERSION_CODES.CUPCAKE;
    useOneShotPreviewCallback = Build.VERSION.SDK_INT > 3; // 3 = Cupcake

    previewCallback = new PreviewCallback(configManager, useOneShotPreviewCallback);
    autoFocusCallback = new AutoFocusCallback();
    
    pictureCallback = new PictureCallback();
  }

  /**
   * Opens the camera driver and initializes the hardware parameters.
   *
   * @param holder The surface object which the camera will draw preview frames into.
   * @throws IOException Indicates the camera driver failed to open.
   */
  public void openDriver(SurfaceHolder holder) throws IOException {
    if (camera == null) {
        try{
            camera = Camera.open();
            camera.setPreviewDisplay(holder);

        }catch (Exception e){

            throw new IOException();
        }
        if (camera == null) {
            throw new IOException();
        }

      if (!initialized) {
        initialized = true;
        configManager.initFromCameraParameters(camera);
      }
      configManager.setDesiredCameraParameters(camera);


    }
  }

	/**
	 * Closes the camera driver if still in use.
	 */
	public void closeDriver() {
		if (camera != null) {
			camera.release();
			camera = null;
		}
	}
	
	public void enableFlashlight(){
		if (camera != null) {
			try {
				Parameters p = camera.getParameters();
				p.setFlashMode(Parameters.FLASH_MODE_TORCH);
				camera.setParameters(p);
			} catch (RuntimeException e) {
				CLog.w(TAG, "Could not set flash mode: " + e);
			}
		}
	}
	public void disableFlashlight() {
		if (camera != null) {
			try {
				Parameters p = camera.getParameters();
				p.setFlashMode(Parameters.FLASH_MODE_OFF);
				camera.setParameters(p);
			} catch (RuntimeException e) {
				CLog.w(TAG, "Could not set flash mode: " + e);
			}
		}
	}
  /**
   * Asks the camera hardware to begin drawing preview frames to the screen.
   */
  void startPreview() {
    if (camera != null && !previewing) {
      camera.startPreview();
      previewing = true;
    }
  }

  /**
   * Tells the camera to stop drawing preview frames.
   */
  void stopPreview() {
    if (camera != null && previewing) {
      if (!useOneShotPreviewCallback) {
        camera.setPreviewCallback(null);
      }
      camera.stopPreview();
      previewCallback.setHandler(null, 0);
      autoFocusCallback.setHandler(null, 0);
      previewing = false;
    }
  }

  /**
   * A single preview frame will be returned to the handler supplied. The data will arrive as byte[]
   * in the message.obj field, with width and height encoded as message.arg1 and message.arg2,
   * respectively.
   *
   * @param handler The handler to send the message to.
   * @param message The what field of the message to be sent.
   */
  void requestPreviewFrame(Handler handler, int message) {
    if (camera != null && previewing) {
      previewCallback.setHandler(handler, message);
      if (useOneShotPreviewCallback) {
        camera.setOneShotPreviewCallback(previewCallback);
      } else {
        camera.setPreviewCallback(previewCallback);
      }
    }
  }

  /**
   * Asks the camera hardware to perform an autofocus.
   *
   * @param handler The Handler to notify when the autofocus completes.
   * @param message The message to deliver.
   */
  void requestAutoFocus(Handler handler, int message) {
    if (camera != null && previewing) {
        autoFocusCallback.setHandler(handler, message);
        try {
            camera.autoFocus(autoFocusCallback);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
  }

  public Point getResolution(){
	  return configManager.getScreenResolution();
  }
  /**
   * Calculates the framing rect which the UI should draw to show the user where to place the
   * barcode. This target helps with alignment as well as forces the user to hold the device
   * far enough away to ensure the image will be in focus.
   *
   * @return The rectangle to draw on screen in window coordinates.
   */
  public Rect getFramingRect() {
    Point screenResolution = configManager.getScreenResolution();
      if(screenResolution==null){
          initialized = true;
          configManager.initFromCameraParameters(camera);
          configManager.setDesiredCameraParameters(camera);
          screenResolution = configManager.getScreenResolution();
      }


    if (framingRect == null) {
      if (camera == null) {
        return null;
      }
      float cardw;
      float cardh;
      float fper = 0.63084f;
      float heightPad = 50;
      if( screenResolution.x * fper  - heightPad > screenResolution.y){
    	  cardh = screenResolution.y - heightPad ;
    	  cardw = cardh / fper;
      }else{
    	  cardw = screenResolution.x;
    	  cardh = cardw * fper;
      }      
      
      //适配小屏
      if (cardh > screenResolution.y) {
    	  heightPad = 10;
    	  cardh = screenResolution.y - heightPad ;
    	  cardw = cardh / fper;
      }

      float lft = (screenResolution.x-cardw)/2;
      float top = heightPad / 2;    
   
      framingRect = new Rect((int)lft, (int)top, (int)(lft + cardw), (int)(top + cardh));
    }
    return framingRect;
  }

  /**
   * Like {@link #getFramingRect} but coordinates are in terms of the preview frame,
   * not UI / screen.
   */
  public Rect getFramingRectInPreview() {
    if (framingRectInPreview == null) {
      Rect rect = new Rect(getFramingRect());
      Point cameraResolution = configManager.getCameraResolution();
      Point screenResolution = configManager.getScreenResolution();
      rect.left = rect.left * cameraResolution.x / screenResolution.x;
      rect.right = rect.right * cameraResolution.x / screenResolution.x;
      rect.top = rect.top * cameraResolution.y / screenResolution.y;
      rect.bottom = rect.bottom * cameraResolution.y / screenResolution.y;
      framingRectInPreview = rect;
    }
    return framingRectInPreview;
  }

  /***
   * return camera
   */
  public Camera getCamera()
  {
	  if (camera != null){
		  return camera;
	  }
	  return null;
  }
  /**
   * take picture
   * */
  void takePicture(CaptureListener captureListener)
  {
      previewing = false;
	  //pictureCallback.SetActivity(captureListener);
	  camera.takePicture(captureListener.getShutterCallback(), null, pictureCallback); // picture
  }
  
  public CameraConfigurationManager getCCM(){
	  return configManager;
  }



}
